I'm going to go out on a really big limb here:
The U.S. buys things from communist countries because they make things that you and I want to buy.
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Every part of China was Communist, ever since 1949 until the 1970s, when Chairman Deng Xiaoping instituted capitalism and free trade reforms. Since then, China has no longer been communist in practice, as the nation currently violates many tenets of communism (for example, communist countries by definition have free trade, which China does)
The pledge made by the United States of America to defend the middle east countries from communist takeovers is known as the Einsenhower doctrine. It is well respected and carried out by all US government.
communist countries led by the Soviet Union
It was a non-Communist trade union in a Communist country
Thomas Jefferson banned all the trade with foreign countries because British had attacked US ships.